Hydrothermal synthesis of unsupported MoS2 as catalyst for hydrodesulfurization of gas oil

摘要

Hydrothermal synthesis with ammonium heptamolybdate and thiourea as precursors was used to obtain an unsupported MoS2 catalyst. The catalyst was obtained in sulfide state directly at mild reaction conditions (i.e., 180 degrees C during 5h). After catalyst was obtained, it was characterized through nitrogen physisorption, transmission electron microscopy, energy-dispersive spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Catalytic evaluation was carried out in a batch reactor at 350 degrees C, 55 bar of hydrogen pressure, 750rpm, and 3h of reaction time using straight-run gas oil (SRGO) as feedstock. A commercial CoMo/Al2O3 catalyst was used for comparison of activity. The synthesized catalyst was slightly more active toward SRGO hydrodesulfurization than commercial one keeping constant the sulfur removal after two runs.